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// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// macho_dump.cc: Dump the contents of a Mach-O file. This is mostly
// a test program for the Mach_O::FatReader and Mach_O::Reader classes.
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <mach-o/arch.h>
#include <sys/mman.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sstream>
#include <string>
#include <vector>
#include "common/byte_cursor.h"
#include "common/mac/arch_utilities.h"
#include "common/mac/macho_reader.h"
using google_breakpad::ByteBuffer;
using std::ostringstream;
using std::string;
using std::vector;
namespace {
namespace mach_o = google_breakpad::mach_o;
string program_name;
int check_syscall(int result, const char *operation, const char *filename) {
if (result < 0) {
fprintf(stderr, "%s: %s '%s': %s\n",
program_name.c_str(), operation,
filename, strerror(errno));
exit(1);
}
return result;
}
class DumpSection: public mach_o::Reader::SectionHandler {
public:
DumpSection() : index_(0) { }
bool HandleSection(const mach_o::Section §ion) {
printf(" section %d '%s' in segment '%s'\n"
" address: 0x%llx\n"
" alignment: 1 << %d B\n"
" flags: %d\n"
" size: %ld\n",
index_++, section.section_name.c_str(), section.segment_name.c_str(),
section.address, section.align,
mach_o::SectionFlags(section.flags),
section.contents.Size());
return true;
}
private:
int index_;
};
class DumpCommand: public mach_o::Reader::LoadCommandHandler {
public:
DumpCommand(mach_o::Reader *reader) : reader_(reader), index_(0) { }
bool UnknownCommand(mach_o::LoadCommandType type,
const ByteBuffer &contents) {
printf(" load command %d: %d", index_++, type);
return true;
}
bool SegmentCommand(const mach_o::Segment &segment) {
printf(" load command %d: %s-bit segment '%s'\n"
" address: 0x%llx\n"
" memory size: 0x%llx\n"
" maximum protection: 0x%x\n"
" initial protection: 0x%x\n"
" flags: %d\n"
" section_list size: %ld B\n",
index_++, (segment.bits_64 ? "64" : "32"), segment.name.c_str(),
segment.vmaddr, segment.vmsize, segment.maxprot,
segment.initprot, mach_o::SegmentFlags(segment.flags),
segment.section_list.Size());
DumpSection dump_section;
return reader_->WalkSegmentSections(segment, &dump_section);
}
private:
mach_o::Reader *reader_;
int index_;
};
void DumpFile(const char *filename) {
int fd = check_syscall(open(filename, O_RDONLY), "opening", filename);
struct stat attributes;
check_syscall(fstat(fd, &attributes),
"getting file attributes for", filename);
void *mapping = mmap(NULL, attributes.st_size, PROT_READ,
MAP_PRIVATE, fd, 0);
close(fd);
check_syscall(mapping == (void *)-1 ? -1 : 0,
"mapping contents of", filename);
mach_o::FatReader::Reporter fat_reporter(filename);
mach_o::FatReader fat_reader(&fat_reporter);
if (!fat_reader.Read(reinterpret_cast<uint8_t *>(mapping),
attributes.st_size)) {
exit(1);
}
printf("filename: %s\n", filename);
size_t object_files_size;
const struct fat_arch *object_files
= fat_reader.object_files(&object_files_size);
printf(" object file count: %ld\n", object_files_size);
for (size_t i = 0; i < object_files_size; i++) {
const struct fat_arch &file = object_files[i];
const NXArchInfo *fat_arch_info =
google_breakpad::BreakpadGetArchInfoFromCpuType(
file.cputype, file.cpusubtype);
printf("\n object file %ld:\n"
" fat header:\n:"
" CPU type: %s (%s)\n"
" size: %d B\n"
" alignment: 1<<%d B\n",
i, fat_arch_info->name, fat_arch_info->description,
file.size, file.align);
ostringstream name;
name << filename;
if (object_files_size > 1)
name << ", object file #" << i;
ByteBuffer file_contents(reinterpret_cast<uint8_t *>(mapping)
+ file.offset, file.size);
mach_o::Reader::Reporter reporter(name.str());
mach_o::Reader reader(&reporter);
if (!reader.Read(file_contents, file.cputype, file.cpusubtype)) {
exit(1);
}
const NXArchInfo *macho_arch_info =
NXGetArchInfoFromCpuType(reader.cpu_type(),
reader.cpu_subtype());
printf(" Mach-O header:\n"
" word size: %s\n"
" CPU type: %s (%s)\n"
" File type: %d\n"
" flags: %x\n",
(reader.bits_64() ? "64 bits" : "32 bits"),
macho_arch_info->name, macho_arch_info->description,
reader.file_type(), reader.flags());
DumpCommand dump_command(&reader);
reader.WalkLoadCommands(&dump_command);
}
munmap(mapping, attributes.st_size);
}
} // namespace
int main(int argc, char **argv) {
program_name = basename(argv[0]);
if (argc == 1) {
fprintf(stderr, "Usage: %s FILE ...\n"
"Dump the contents of the Mach-O or fat binary files "
"'FILE ...'.\n", program_name.c_str());
}
for (int i = 1; i < argc; i++) {
DumpFile(argv[i]);
}
}